Chuck



Patented July 371, 192.8'.

UNITED STATES PATENT OFFICE.

THOMAS J. FEGLEY AND GEORGE O. LEOPOLD, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO NORTH BROS. MFG. C0., OF PHILADELPHIA, PENNSYLVANIA,. A

CORPORATION OF PENNSYLVANIA.

` CHUCK.

Application led August 31, 1923. Serial No. 660,358.y

'This invention relates to certain improvements in chucks for holding bits and drills to tools.

The object' of the invention is to construct the jaws and the spring in such a manner that the ends ot the lspring are held rigidly to the jaws when the chuck is assembled. The construction, however, is such that the jaws can be easily dctachedfrom the spring when necessary.

In the accompanying drawings: Fig. 1 is a sectional view of a chuck, illus-V trating our improvement; l

Fig. 2 is a detached sectional view of the jaws, showing the spring connected thereto; Fig. 3 is aside view of the jaws and spring shownin Fig. 2;

Fig. 4 is a. detached perspective view of the spring; and Fig. 5 is a detached perspective view of the two jaws.

Referring to the dra-wings l is the body portion of a chuck having a screw thread on its periphery. The chuck is slotted at 3 to receive the two jaws 4 4. These jaws are shaped as shown in Figs. 2 and 5. Mounted on the threaded portion ofthe body 1 is a sleeve 5 of a casing 7. This sleeve has an annular flange 6 and a screw thread beyond the flange.

8 designates the shell of the casing. This shell is screw threaded at its inner end to engage the threaded portion of the sleeve 5.

Atthe outer end of the shell is an internal [lange E), which forms a bearing for a movable portion 10 ot a ball bearing 11, in the present instance. The movable portion 10 has a conical opening. The inclined wall of this opening corresponds to the beveled end 1Q ot the jaws Ll. The inner ends y13 otthe jaws are beveled to fit the inclined portions '14 ot the body'1. l

By this construction` the'jaws are capable ot being moved towards each other. A

spring 15 tends to separate the jaws and to hold them against their beveled bearings.

The spring 15 is sha ed as shown. in Fig. 4.-.

The inner end 16 ot the spring 1s reduced in width and forms shoulders 17.` The re-` duced portion fits the opening 18 in the body portion land the shoulders 17 are located in the narrow slot 19 Aof the body portion.

By the arrangement hereinbefore described, the jawsvare held parallel with the body portion in opening andclosing. The back of each jawV has a longitudinalgroove 2O therein and the portion 21 of the spring is adapted to the groove in the jaws.

In oider to prevent the spring moving independently of vthe jaws, the groove is closed by upsetting the metal at points V2:2 and 22a. These points are spaced apart in order to leave an opening 23 through which extends a hook portion 24 ot' the spring, as

shown clearly in Figs. 2 and 3. The upset-` ting of the metal is such as to leavea space under the metal that is forced across the groove 20 so that the jaws can be hooked onto the spring or removed therefrom, when desired. Then the spring is in position, the jaws are firmly connected to the ends ofthe spring.

We claim: i

The combination ina chuck, of a body portion having an external screw-thread, and having a transverse slot at its outer end, the walls of the slot having inclined bearing portions, the body portion also having a central opening extending inwards from the slot; two jaws mounted in the slot, said jaws having beveled ends, the inner ends of the jaws arranged to slide on the inc-lined bearing poitions'of the body; a U-shaped spring having a reduced portion extending beyond the jaws and into the central opening, the arms of the spring having shoulders located in the inner portion of the transverse slot in the body and beyond the jaws and extending back of the jaws, said arms being connected to the jaws at their outer ends; a casing; a sleeve secured thereto, said sleevebeing mounted on the threaded portion of the body; and a bearing carried by the casing and having a conical 

